(1)sinAcscA=1(2)cosAsecA=1(3)tanAcotA=1(4)tanA=sinA/cosA(5)cotA=cosA/sinA(6)sin2A+cos2A=1(7)sec2A-tan2A=1(8)csc2A-cot2A=1(9)sin(A±B)=sinAcosB±cosAsinB(10)cos(A±B)=cosAcosB±sinAsinB(13)sin2A=2sinAcosA(14)cos2A=cos2A-sin2A (共 220 字) [阅读本文] >>
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